d laws of mechanics; and, demonstrably competent to produce the observed phe- curvilinear forms which, adding to their beauty, sprang out- from the composition, resolution, and interference of its vi- nomena. Substituting a piece of Iceland spar, A, Fig. 3, wards from the two points of pressure.… … ‘neutral ‘axes from spaces of pressure, showed ‘as‘before. A tween the'polarizer and the spar, we have an image of the ing lecture) between the Nicol prisms. It will be remem- aperture on the screen in the shape of two colored circles, bered that, where two plates of tourmaline were crossed, no the…
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